Why do deserts in Australia support so many lizard species?

Australian deserts support an exceptionally high number of lizard species—sometimes 40 or more in a single area—primarily due to their ability to partition resources along three fundamental niche axes: time, food, and place.1

• Time: Different species are active at distinct times of the day, such as at night, in the morning, or at midday.1
• Food: While some lizards are generalists, others specialize in specific diets, such as ants or termites.1
• Place: Species occupy specific microhabitats, ranging from small shrubs and open sand to tree trunks.1

This specialization, combined with the high structural diversity of the desert environment, allows a large number of species to coexist within a small area. Furthermore, lizards are highly successful in arid environments because they have low metabolic rates compared to birds and mammals, which reduces their water requirements. They also excrete nitrogenous waste as uric acid, minimizing liquid loss, and many insectivorous species obtain sufficient hydration directly from their prey. These physiological adaptations, alongside the evolutionary history of the region, have made Australian deserts a global hotspot for lizard biodiversity.123